Here Drain sump details including 120mm thick slab A sump pit drainage system includes a sump pit, a sump pump and a pump discharge pipe. The sump pit, set into the basement floor, collects water from the weeping tiles around your basement. The pump pushes the water outside your house through the discharge pipe. A sump can also be an infiltration basin used to manage surface runoff water and recharge underground aquifers. the designated perimeter drains in a basement's system of waterproofing, or by gravity because of groundwater or rainfall, if the basement happens to be below the water table level. for more details of Drain sump download this file.